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Патент USA US2114509

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C. W. STOLL
2,114,509
GREASE GUN
Filed May 26,> 1956
3 Sheets-Sheet' 1
April 19, 1938.
C, w_ STOLL
2,114,509
lGREASE GUN
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Filed May 25,
1936
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2,114,509
GREASE GUN
Filed May 26, 1936
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Patented Apr. 19, 1938
2,114,509
UNITED STATES PATENT OFFICE
l2,114,509
GREASE GUN
Carl W. Stoll, Los Angeles, Calif., assignor to
Smith-Johnson Corporation, Los Angeles,
Calif., a corporation of California
Application May 26, 1936, Serial No. 81,846
23 Claims. (Cl. 221-47.4)
This invention relates to lubricant handling
apparatus and relates more particularly to port
able grease guns. A general object of this inven
tion is to provide a compact, practical and effec
. I tive grease gun that may be readily and quickly
conditioned for the manual ejection of the lu
bricant or the powel` ejection of the lubricant.
Another object of this invention is to provide
a convertible grease gun embodying a lubricant
container assembly having a discharge tube for
delivering the lubricant to the parts to be lubri
cated, a high pressure lubricant cylinder and
means for feeding lubricant from the container
to the cylinder, which assembly is adapted to re
ceive a handle and ram unit for the ejection of
held by the operator, thus promoting the easy
convenient manipulation of the gun.
Another object of this invention is to provide
a convertible manually actuated and power ac
tuated grease gun of the character mentioned
that embodies a spring loaded or spring urged
follower for feeding the lubricant to the con
tainer.
Another object of this invention is to provide
a lubricant container assembly for a convertible
grease gun of the character mentioned that em
bodies a spring actuated follower for feeding
lubricant to the ejector cylinder that is such
that the spring for motivating the follower is
withdrawn through the forward end of the con
15
the lubricant from the cylinder under the pres
tainer when loading or drawing a supply of lu
sure of a manual thrust on the device, and is also
adapted to receive a power operated ram unit
embodying a ram operable in said cylinder by a
bricant into the container by means of the fol
lower.
Another object of this invention is to provide
a convertible manually actuated and power ac-_y
tuated grease gun of the character mentioned
characterized by a lubricant container embody
ing a fluid pressure actuated follower for feed
20 lsuitable ñuid under pressure to eject the lubri
cant to the ports to be lubricated. The single
container, discharge tube, and cylinder assem
bly of the present invention may be easily adapt
ed for the handling of lubricants of various
25 grades or types and for the lubrication of vari
ous machine parts by merely ìnterchanging the
manually actuated ra'm unit and the power oper
ated ram unit.
Another object of this invention is to provide
0 a convertible grease gun of the character men
ing lubricant to the ejector cylinder, which fol
lower operates on or over a normally stationary ,
discharge tube which does not require packingN
between normally relatively movable parts to
prevent the loss of charging fluid pressure at
the forward end of the gun.
Another object of this invention is to provideß
tioned in which the manually operated ram unit
a convertible grease gun of the character men-"`
and the iluid pressure actuated ram unit may
tioned embodying a novel ported centering part
or unit that admits the lubricant to the ejector
cylinder and that receives and properly centers
the rams of the exchangeable power actuated4
be easily and quickly exchanged without dis
turbing or removing any parts of the container,
35 discharge tube and cylinder assembly and, if de
sired, without changing the grade or type of
lubricant in the container.
Another object of this invention is to provide
a self-contained grease gun characterized by a
40 lubricant container and ejector cylinder assem
bly that is adapted to receive either a high pres
sure manually actuated ram unit or a low pres
sure manually actuated ram unit for effecting
the
ejection of the lubricant under pressure.
e. ci
The lubricant container, discharge tube, and cyl
inder assembly may be quickly conditioned for
use with the high or low pressure manually
operated ram units without the removal or al
;,0 teration of any parts.
Another object of this invention is to provide
a portable self-contained grease gun in which
the principal mass of the lubricant and the eject
ing mechanism are adjacent the rear or inner
end of the gun where the gun is supported and
ram unit and the >manually actuated ram unit.
`
Another object of this invention is to provide
a compact and particularly effective handle and
manually operable ram unit for a convertible
grease gun of the character mentioned.
,
Another object o-f this invention is to providey
a simple, compact and eflicient manually con
trolled power actuated ram unit for a convertible y
grease gun of the character mentioned.
A further object of this invention is to pro
vide a portable self-contained grease gun in"
which practically the entire shell or body of the
gun may be utilized to store or contain lubricant.
The various other objects and features of my
invention will be fully understood from thefol
lowing detailed description of typical preferred
forms' and applications of the invention,
throughout which description reference is made
to the accompanying drawings, in which:
Fig. 1 is a central longitudinal detailed sectional 55
2
2,114,509
view of the combination of the pneumatically
primed container assembly and the manually 0p
erable low pressure ram unit. Fig. 2 is a side ele
vation of the container assembly illustrated in
Fig. l showing the power actuated ram unit in
conjunction therewith, the ram unit and the ad
jacent part of the container being in central ver
tical cross section. Fig. 3 is an enlarged frag
mentary vertical detailed sectional View of the
manually operable low pressure rarn unit. Fig.
4 is an enlarged fragmentary vertical sectional
View of the pneumatically primed container as
sembly. Fig. 5 is a central longitudinal detailed
sectional view of the spring loaded container as
sembly. Fig. 6 is an enlarged fragmentary ver
tical detailed sectional View of the power oper
ated ram unit and Fig. 7 is a vertical detailed sec
tional view of the high pressure manualy oper
able ram unit applied to a container assembly.
The present invention is directed to a grease
gun that may be converted from a low pressure
or a high pressure hand operated device to a
power actuated device at the will of the operator,
whereby it may handle Various lubricants and
may be employed in the lubrication of machine
parts and bearings of different types. In the
following detailed disclosure I will describe sev
eral typical embodiments of the invention, it be
ing understood that the invention is not to be
30 construed as limited or restricted to the specific
details set forth, but that it is to be taken as
including any features or modifications that may
fall within the scope of the claims.
The form of the invention and the combina
tion of parts illustrated in Figs. l and 3 of the
drawings comprises, generally, a lubricant con
tainer III having a discharge tube II, an ejector
cylinder I2 associated with the tube II, a fluid
pressure actuated follower I3 in the container IIJ
40 for feeding lubricant to the cylinder I2, and a
manually operable ram unit I ‘l removably con
nectedwith the container I8 and operable to
force charges of lubricant from the cylinder I2
through the discharge tube I I.
45
The container I8 comprises the main part or
body of the gun and is adapted to carry and store
a supply of lubricant and to support the tube II,
the cylinder' I2, etc. In the preferred construc
tion the container Iii is in the nature of an elon
50 gate substantially cylindrical assembly propor
tioned to be conveniently handled by the operator.
In practice the container I8 may comprise a main
tubular section I5, a forward head or cap IIB,
and a rear head or cap I'I. The section I5 may
55 be in the form of an elongate cylindrical tube
having its opposite end portions threaded for the
reception of the caps I6 and I'I. In accordance
with the invention an annular inwardly curled
lip I8 is provided on the section I5 at its rear
60 end. The forward cap .I6 closes the forward end
of the section I5 and forms a support for the
tube I I. The cap I6 may have an annular flange
9 threaded to the forward end of the section I5.
A’ central boss I9 is provided on the cap I6. The
65 cap Il is preferably removably secured to the sec
tion I5 so that it may be easily removed to give
access to the interior of the container, to permit
loading of lubricant in the container, etc. The
70 cap I'i may have an annular flange 8 threaded
on the rear end vof the section I5. A forwardly
facing internal shoulder 2l is provided on the
interior of the cap Il and a sealing gasket 22 is
clamped between the shoulder 2l and the lip
I8 to provide a seal between the cap and the sec
tion I5. The rear cap I1 may be tapered rear
wardly to a reduced central boss 23.
The discharge tube II is provided to conduct
the ejected lubricant under pressure to the parts
to be lubricated or to a fitting or conduit for con
veying the lubricant to the machine parts. The
tube II enters the forward end of the container
Iû and extends rearwardly through the container
to a point adjacent its rear end. The tube II
extends through an opening 20 in the boss I9
and is preferably co-axial with the container sec
tion I5. During the operation of the grease gun
the discharge tube I I is relatively stationary and
is secured or fixed to the cap I6. A forwardly
facing shoulder 24 is provided on the boss I9 15
and a flange or collar 25 is ñxed to the tube II
and bears rearwardly against the shoulder 24.
A sealing gasket 23 may be interposed between
the shoulder 24 and the collar 25. In the par
ticular construction illustrated the collar 25 is 20
brazed or welded to the rod II. A nut 21 is re
movably threaded in the opening 28 in the boss
I9 to clamp the collar 25 rearwardly against the
gasket 2B and thus hold the tube I I against move
ment. The nut 2l may be unthreaded from the
boss I3 to permit longitudinal movement of the
tube I I for the purpose of drawing lubricant into
the container Ill as will be subsequently described.
A conduit or extension 28 may be secured to the
outer end of the tube II and may be provided " 30
with a discharge fitting 28 for cooperating with
the lubricant receiving fittings on the bearings or
parts to be lubricated. It will be noted that the
normally stationary tube I I may be a simple mem- .
ber of uniform external diameter.
The high pressure cylinder or ejector cylinder
I2 is connected with the rear end of the discharge
tube II. In practice the cylinder I2 may be an
integral tubular part. The cylinder I2 is pref
erably axially aligned with the discharge tube
II and may be secured to the tube in any suit
In the case illustrated, a reduced
pin 28 is provided on the forward end of the
cylinder I2 and is threaded into a central socket
29 in the rear end of the tube II. The cylinder ‘
able manner.
‘
I2 is thus axially aligned with the tube II. The
cylinder I2 may project into the tapered cap
I'I and its rear end is open to receive the ram
of the unit I4. A stop shoulder 3D is provided
on the exterior of the cylinder I2 to limit the 50
rearward travel of the follower I3.
An outlet valve is provided at the forward end
of the cylinder I2. The outlet valve may com
prise a ball 3I urged against a seat 32 by a spring
33. The seat 32 may be formed directly on the Ul Ul
forward end of the cylinder pin 28 and the spring
33 may be arranged under compression- between
the valve 3I and a suitable stop ring 34 in the
tube II. It is preferred that a port 35 of re
duced diameter extend from the interior of the- 60
cylinder I2 to the seat 32 to be under the con
trol of the valve 3|.
The invention provides a. novel fitting or guide
36 at the rear end of the cylinder I2 for admit
ting lubricant to the cylinder and for guiding 65
and locating the ram of the ram unit for opera
tion in the cylinder. The guide 36 may be car
ried by the cap I1 to engage about the rear end
of the cylinder I2.
In practice the guide 36
may have its rear portion threaded into a cen
70
tral opening 31 in the boss 23. A longitudinal
opening 38 is provided in the guide 36 and is
longitudinally aligned with the opening of the
cylinder I2. A socket 39 is provided in the for
Ward end of the guide 36 and receives the rear 75
2,114,509
portion of the cylinder' I2. A plurality of lat
eral parts 40 is provided in the Wall of the guide
36 to deliver lubricant from the container I0 to
the rear end of the cylinder I2. Strainers or
screens 4I are arranged across the outer ends of
the ports 40 to prevent the admission of foreign
matter to the cylinder I2.
The form of container assembly being de
scribed is fluid pressure primed or actuated to
10 feed lubricant to the cylinder I2 and embodies
the piston or follower I3 operable in> the con
tainer IIJ. 'I‘he follower I3 surrounds the dis
charge tube II and is operable rearwardly in the
container I Il against the mass of lubricant in
-15 the container.
The follower I3 may comprise a
single packing member 42 clamped between two
plates 43. A lip or flange 44 is provided on the
periphery of the packing member 42 to slidably
seal with the internal Wall of the container sec
20 tion I5. A forwardly projecting flange 45 may
be provided on the packing member 42 to slid
ably seal with the discharge tube II. The for
ward plate 43 may be bent or formed to permit
the proper operation of the sealing flange 45.
25
Means is provided to admit air or other fluid
under pressure to the forward end of the con
tainer I0 to act against the follower I3. In prac
tice a suitable air admitting check valve 46 may
be provided in the cap IE to admit air under
30 pressure to the container IB from an air hose
such as found in service stations, garages, etc.
It is preferred to provide a relief valve 4‘I on the
cap I6 to permit the discharge of the fluid under
pressure from the container I0 when it is desired
35 to reload the container 0r exchange the actuating
ram units. The relief valve 4’I may be in the
nature of a simple needle manual valve control
ling a port 48 in the Wall of the cap I6. It will
be apparent how fluid under pressure in the
forward portion of the container ID presses the
follower lI3 rearwardly against the body of lubri
cant to feed the lubricant into the cylinder I2
through the ports 4I). The flange 3D on the cyl
inder I2 is operable to limit the rearward travel
of the follower I3.
3
further forward movement of the follower I3
when the tube I I is pushed back into the con
tainer I0 after the cap I'I has been again secured
rto the rear end of the container.
It is to be
noted that the tube II is normally fixed or sta
tionary with respect to the container .III and is
sealed about by the simple gasket 28 so that
there is no necessity for a sealing means for
packing about any reciprocating parts at the
forward end of the gun to prevent the loss of air 10
pressure.
’
.
The air primed or fluid pressure primed con
tainer assembly just described is adapted to
receive the manually actuated ram unit I4, the
fluid pressure actuated ram unit I4a illustrated 15
in Figs. 2 and 6 or the high pressure manually
actuated ram unit I4‘D illustrated in Fig. '7. The
ram units I4 and I4b illustrated in Figs. 1 and
7 are in the nature of manually operable means
for ejecting charges of lubricant from the cyl 20
inder I2 while the ram unit I4fL illustrated in
Figs. 2 and 6 is in the nature of a power actuated
or pneumatically actuated ram unit. In accord
ance with the invention the units I4, I4a and
I 4b may be interchangeably employed on the 25
container assembly described above or on the
spring loaded container assembly illustrated in
Fig. 5 of the drawings.~
The manually operable ram unit I4 in addi
tion to forming an ejecting means constitutes a
handle means for facilitating the manipulation
of the gun. The unit I4 includes a guide tube 50
removably secured to the cap I'I, a handle 5I
reoiprocable on the tube 53 and a ram 52 movable
with the handle 5I and operable in th-e cylinder 35
I2. The tube 5I) of the unit I4 is provided at its
forward end with means for detachably connect
ing with the cap I'I of the container I Il. In prac
tice a socket member 53 is provided on the for
ward end of the tube 50 and is threaded on the» 40
boss 23 to removably secure the unit >I4 to the
container I0. The socket member 53 may be
threaded on the tube 5G and then Welded to the
tube to be rigid therewith.
The handle 5I may have the configuration of. 45
a pistol grip to be conveniently grasped. The
The tube II and the follower I3 may be con
veniently employed to load or charge the con ~ handle 5I is normally at the outer end of the tube
tainer IU with lubricant. To charge the con
50 and is shiftable or reciprocable on the tube
tainer I 0 with lubricant the valve~41 is first to operate the ram 52. A tubular boss 54 on the
.opened to relieve pressure at the rear of the fol
forward side of the handle 5I shiftably receives:
lower I3 and the nut 2l is unthreaded from the the tube 5I). Pins 55 project inwardly from the 50
boss I9 to permit forward movement of the tube boss 54 and operate in slots 5S in the guide tube
II. The cap I'I is unthreaded from the c'on
50 to prevent turning of the handle on the tube
tainer section I5 and the open rear end of the
and to limit the movement of the handle. The
container section I5 is inserted in a supply of operating handle 5I may be hollow to be inex- ~
the desired lubricant. The tube I I is then pulled pensive and light in Weight.
outwardly or forwardly relative to the container
The plunger or ram 52 of the unit I4 is secured
I0 and the shoulder 33 cooperates with the fol
to the handle 5I to move therewith. The ram
lower I3 to move the follower with the tube. As
52 is an elongate rod-like member extending
the tube II is pulled outwardly the follower I3
sucks or draws the charge of lubricant into the
rear end of the section I5.
'I‘he invention provides a novel stop for limit
ing the forward charging movement of the .fol
lower I3. A coiled spring 49 surrounds the tube
I I and is secured to or bears on the cap I6. When
through the guide tube 5I! with suitable clearance 60
to project into the guide 35 and operate in the
cylinder I2. The rear portion of the ram 5.2 may
be threaded into a socket 51 in the rear wall of
the handle 5I to secure the ram to the handle.
The ram 52 extends through a suitable packing 65
gland 58 in the forward end of the guide tube
50. rI’he gland 58 has an inner part 58a threaded
the follower I3 approaches the end of its for
ward lubricant charging stroke the forward plate . in the tube 50 to maintain the packing of the
43 engages the spring 49. The spring 49 yield
gland under compression. The ram 52 is suili
70 ingly limits the forward movement of the folciently long to at all times extend into or through
lower I3 and operates to stop the follower in a the Aguide 36. Upon forward movement of >the
4position where a suitable space is left in the handle 5I relative to the container Ill the ram 52
~'forward portion of the container III to receive moves forwardly into and through the cylinder I2
the ,air under pressure for acting against the to displace a charge of lubricant therefrom yinto
follower. The spring 49 also yields to permit the
_discharge tube .I I. Means is provided `for re
2,114,509
4
turning the handle 5I and the ram 52 to their
normal positions after actuation of the ram. A
spring 59 surrounds the ram 52 and is arranged
under compression between the packing part 58a
and the rear wall of the handle 5I. The spring
5S operates to normally hold the handle 5I and
the ram 52 in their rear positions and to return
them to their normal rear positions after each
actuation of the ram.
10
If it is desired to employ the grease gun to force
charges of lubricant under pressure to parts to be
>lubricated by means of the relatively low pressure
manual ram unit I4, the unit I4 may be assembled
on the container IB as illustrated in Fig. 1 of the
drawings. The container Ill may have been pre
viously filled or charged with a suitable lubricant
by means of the discharge tube Il and follower
I3 in the manner described above. It may be
desired or found necessary to provide air or
suitable fluid under pressure in the forward por
tion of the container I0 to feed lubricant from the
container into the cylinder I2.
To actuate the gun the ñtting 29 is arranged
against the grease receiving fitting which is to
receive the charges of lubricant and a thrust or
pressure is applied to the handle 5| to effect for
ward movement of the ram 52 relative to the con
tainer II) so that the ram enters and moves for
wardly in the cylinder l2 to displace or force a
30 charge of lubricant from the cylinder into the
tube Il. At the completion of the forward move
ment of the handle 5I the operator while holding
the container I0 stationary, with the fitting 29
against the grease receiving fitting, allows the
handle 5l to move rearwardly under the action of
the spring 5.9. Rearward movement of
the
handle 5l and the ram 52 to their rear positions
evacuates the cylinder I2 and allows a charge of
lubricant to be forced into the rear end ofthe cyl
inder I2 through the ports 4I). The follower I3
pressing against the forward end of the body of
grease in the container Il) aids in feeding the
lubricant to the cylinder !2. The above operation
may be repeated to successively force charges of
45 lubricant under pressure into and through the
tube l I to the grease receiving fitting.
As there are no normally moving or recipro
cating parts at the forward end of the container
I0 there is little danger of the leakage of charging
fluid pressure from the forward portion of the
part and is axially aligned with the container I0
when in position on the assembly as illustrated in
Figs. 2 and 6 of the drawings and has an integral
forward end wall. A threaded cap or plug 62
closes the rear end of the cylinder 60. A central
socket 63 is provided in the forward end wall of
the cylinder 60. When the unit I4a is to be em
ployed in connection with the container I0 as
illustrated in Fig. 2 of the drawings the boss 23
is threaded into the socket 63 to removably secure
the unit HIa to the container assembly. The body
is thickened or provided with a flange 64 where
the cylinder 60 and handle 6I join. The handle
6| is preferably hollow to be light in weight and
is preferably integral with the fiange 64 and the
cylinder 60.
The power actuated ram unit Ma includes a
plunger or ram 65 for operating in the cylinder
I2 to eject the lubricant therefrom. The ram
65 may be a simple solid cylindrical member, 20
as illustrated in` the drawings. The ram 65 ex
tends longitudinally through the cylinder S0 and
passes forwardly through a suitable packing gland
65 in the forward wall of the cylinder 60. The
ram 65 is proportioned to at all times project
from the cylinder 60 into the guide 36. The
guide 36 operates to slidably support and guide
the ram 65 and to properly align the ram with
the cylinder I2. In accordance with the inven
tion a piston S'I is provided in the cylinder 60 30
to operate the ram 65. The piston 6l is prefer
ably on or secured to the ram 65. rï‘he piston S1
may comprise a simple packing member 68 held
between plates 69. The plates 69 may be thread
ed or otherwise secured to the ram 65. The pack
ba Cl
ing member '68 has a peripheral flange l0 slidably
sealing with the wall of the cylinder G0. A coile-d
spring 85 is arranged under compression between
the forward wall of the cylinder 6€! and the piston
69 to return the piston 61 and the ram 65 to 40
their normal positions after actuation. A port
86 is provided in the forward wall of the cylinder
60 to permit the free forward actuation of the
piston 61 in the cylinder.
The piston 6l is actuated by fluid under pres 45
sure and the unit Ita includes valve means for
actuating> or controlling the piston 6l. The web
or flange B4 is ported and carries the valve vmeans
for governing the piston 6l. A longitudinal port
as the lubricant is ejected from the gun, It may
be found necessary to provide air under pressure
'Il is provided in the flange 65 and has a branch 50
port -I2 communicating with the rear end of the
cylinder 60. A socket '13 is provided in the rear
end of the flange 64 and an opening 'I4 extends
forwardly from the socket 13. A fitting 'l5 is
threaded in the socket 'I3 and is adapted to re 55
ceive the nipple or ñtting ‘I of an air supply hose
H. A port 1 Ia connects the port '.'I with the inner
portion of the socket 13. A normally closed inlet
in the forward portion of the container I0 from
valve 'I6 is provide-d in the fitting 'I5 to control
container.
The ram 52 may be easily and con
veniently operated through the medium of the
handle 5I. The guide 36 centers and guides the
ram 52 for proper operation in the cylinder l2.
55 The follower i3 automatically moves rearwardly
against the body of lubricant in the container I0
60 time to time during the operation of the gun. The
the admission of the iiuid or air under pressure 60
container I9 may be easily charged with a supply
of lubricant by means of the tube II and the
to the cylinder El). The valve T6 may be in the
natiu'e of a tire valve of the class employed on
the tubes of pneumatic vehicle tires. A rod 19
extends through the opening 'lll and the socket
"I3 and is normally urged forwardly by a spring
'I8 acting against a iiange 'Il on the rod.
Means is provided for controlling the valve 16.
The means for controlling the valve 'I6 includes
-a trigger 80 pivotally supported on a pin BI at 70
the forward end of the flange B4 to be readily en
gageable by a finger of the operator’s hand grasp
ing the handle 6l. The trigger 80 cooperates with
the forward end of the stem 19. When the trig
ger 80 is depressed the rod 'I9 is shifted inwardly
’ follower i3, as fully described above.
The power actuated ram unit Illa illustrated in
65 Figs. 2 and 6 of the drawings is adapted to be
employed on the container assembly illustrated
in Figs. l to 4 of the drawings, or on the container
assembly illustrated in Fig. 5 of the drawings.
The unit IfIa is a separable structure adapted to
70 be removably connected with the rear caps of
the container assemblies illustrated in the draw
ings. The unit Illa comprises a body whose upper
portion is chambered to form a cylinder 60 and
whose lower portion is in the nature of a handle
75 6I. The cylinder 60 is a substantially cylindrical
2,114,509
to open the valve ‘I6 to admit air under pressureto the rear end of the cylinder 60.
A discharge valve 82 is provided at the forward
end of the port 1l. The discharge valve 82 may
be of the same type as the valve i8. A finger 83
is provided on the trigger 88 and is adapted to
cooperate with the stem of the valve 82. The
valve 82 and the finger 83 are related so that
the valve 82 is held in its open position when
10 the trigger 88 is in its normal unactuated position.
The spring ‘I8 operates to urge the stem ‘I9 for
wardly and thus hold the trigger 88 in its normal
position where the valve 82 is maintained open.
A packing gland 8d may be provided at the for
15 ward end of the opening ‘I4 to seal about the
stem 19.
Assuming that the container Hl has been sup
plied with a charge of the desired lubricant in
the manner described above, and that the unit
20 |421, is secured to the container I8, as illustrated
in Figs. 2 and 6 of the drawings, the device oper
ates as follows: The operator may readily manip
ulate the gun and place the discharge fitting 29
against the desired grease receiving fitting pre
paratory to forcing lubricant thereto. The trig
ger 8B may then be depressed to admit air under
pressure to the rear end of the cylinder 68. The
air under pressure admitted to the rear en-d of
the cylinder 69 forces the piston 6l forwardly and
moves the ram 65 forwardly into the cylinder I2.
The valve 82 closes simultaneously with the open
ing of the Valve 'I6 so that the air under pressure
admitted to the cylinder 69 is effective in actu
ating the ram 65. lj‘orward movement of the ram
65 in the cylinder I2 forces a charge of lubricant
under pressure from the cylinder into the dis
charge tube II. When the operator relieves the
5
removably or releasably secured in the cap I Iia
to be normally fixed or rigid with respect to the
container. A collar 25a is fixed to the tube IIa.
In the particular case illustrated the collar 25a
is fixed to the tube IIa by a pin 88. A shoulder
87 is provided in the opening 2'Ia and a nut 28a'
is threaded in the opening 272L to clamp the
collar 25a against the shoulder 8'I and thus hold
the tube I Ia rigid with the container. The cyl
inder I2 may be secured to the rear end of the 10
tube i I ß in the same manner as in the previously
described form of container assembly and a dis
charge valve 3| is provided at the forward end
of the cylinder.
The follower I3a is operable in the container
section I5 to urge or feed the lubricant to the
cylinder I2. The follower I3EL may include two
packing elements or members 88 in abutting rela
tion and surrounding the tube IIe. Plates 89
are provided to clamp the members 8B together. 20..
Peripheral sealing flanges 90 are provided on the
members 88 to seal with the interior of the con
tainer section I5. The flange 98 of the forward
member 88 projects forwardly to seal with the
. internal wall of the section I5 when the follower 25
I3 is moved forwardly. The flange 90 of the rear
member 88 slidably seals with the internal wall
of the section I5 when the follower is moved rear
wardly against the body of lubricant in the con
tainer. Flanges 9| are provided on the members 30'
88 to slidably seal about the discharge tube IIa.
The inner portions of the plates 89 are bowed
outwardly to permit the proper sealing action
of the ñanges 9|.
Y
.
Spring means is provided to urge the follower 35.
I3a rearwardly against the body of lubricant in
the container section I5. A coiled spring 92 sur
pressure on the trigger 89 the spring ‘I8 returns rounds the discharge tube IIa and has one end
the trigger to its normal position allowing the bearing on the collar 25a and one end bearing
40 Valve l5 to close and effecting opening of the
on the forward plate 89. The spring'92 is of suf
Valve 82 whereupon the spring 85 returns the ficient strength and length to urge the follower 40
piston to its original position. The ram 55 moves .
I3a against the body of lubricant in the container
rearwardly with the piston 87 and evacuates the throughout the entire stroke of the follower. The
cylinder I2 allowing a charge of lubricant to be flange 30 on the cylinder I2 limits the rearward
»_ forced through the ports 48 into the cylinder. travel of the follower I3a stopping the follower
The above described operation may be repeated in the rear end part of the section I5. The in 45
to effect the ejection of the desired quantity of vention provides a yielding stop for limiting the
lubricant under pressure to the grease receiving forward travel of the follower I3a when lubricant
fitting.
is being loaded in the container. A coiled or
Fig. 5 of the drawings illustrates a container spiralled spring 93 is secured to or arranged
50
unit or assembly in which the follower |32” is
against a shoulder 94 on the interior of the cap
spring loaded or spring urged. In this assembly |62» and surrounds the discharge tube IIe- The
the container section I5, the cap I'I, the cylinder spring 93 normally projects some ldistance rear
I2 and the guide 36 may be identical with the wardly into the section I5 and is operable to stop
Acorresponding parts of the container assembly the forward movement of the follower I3e at or
illustrated in Figs. l, 2, and 3 of the drawings. A adjacent the forward end of the- section I5. A 55
cap I5a closes the forward end of the container port or vent 94EL is provided in the cap I6a to- place
section i5. In accordance with the invention the the interior of the cap and the forward portion
cap |6U, is extended or tapered forwar-dly so that of the container section I5 in communication
its interior forms a continuation of the interior with the atmosphere.
'
60
of the section I5. A central opening 21a is pro
The container assembly illustrated in Fig. 5
vided in the outer end of the cap Ita. The cap of the drawings may be employed with or pro
’|68 may be provided with a flange 85 threaded vided with the ram unit I4, the ram unit I4a
onto the forward end of the container section I5. or the ram unit I4b as desired or found necessary.
The spring loaded container assembly illus
The operation of the _spring loaded container 65
trated in Fig. 5 of the drawings includes a dis
assembly with any of these ram units is sub
charge tube IIa corresponding in function and stantially the same. In operation, the spring 92
location to the discharge tube I I described above. urges the follower It?a rearwardly against the lu
The tube IIa extends longitudinally in the con
in the container section I5 so that a
tainer to project forwardly through the opening bricant
charge of lubricant is fed to the cylinder I2 dur
2'Ia in the cap i621. The forward projecting end ing each return stroke of the ram. It is to be 70
of the discharge tube IIa may carry suitable particularly noted that substantially the entire
means for conveying the lubricant and for coop
container’section I5 may store or contain lubri
erating with the grease receiving fittings. In cant. 'I'he forward cap I 6a is operable to house
accordance with the invention the tube Ila is the spring 92 in its collapsed or compressed con
75
6
2,114,509
dition so that the section I5 may be substantially
filled with the lubricant to provide for prolonged
operation of the gun without reloading.
The follower I3à and the discharge tube IIa
may be employed to load lubricant in the con
tainer section I5. When it is desired to load
lubricant in the container section I5 the nut 2lia
is ñrst unthreaded from the opening 27a to re
lieve the spring pressure on the follower I3a.
10 The cap I'I which may carry a ram unit is then
removed from the rear end of the section I5 and
the open rear end of the section is plunged or
immersed in the selected lubricant. The dis
charge tube IIa is then pulled upwardly or out
15 wardly relative to the section I5.
The flange 30
engages the rear plate 89 to carry or move the
follower I3a with the tube Ila. The follower I3a
thus moved outwardly or upwardly through the
section I5 draws the lubricant into the lower or
20 rear end of the section. It is to be noted that the
guide tube 55a. The bushing 95 is thus secured to
the tube 53a. Lateral ports 9'! are provided in the
walls of the bushing 95 to register with the inlet
ports 49 of the cylinder i2. Grooves 98 may be
provided in the exterior of the bushing 95 to trap
the lubricant for sealing between the bushing and
the cylinder I2.
The ram 52a is secured to the handle 5Ia to
move therewith and to be reciprocated in the
bushing 95 when the handle is operated or re
ciprocated. The ram 52a extends longitudinally
through the guide tube 55a with substantial
clearance. The rear portion of the ram 52a may
be threaded in a socket or opening 99 in the rear
wall of the handle 5Ia. rI‘he forward active por 15
tion of the ram 52a is reduced in diameter to
properly operate in the bushing 95. A suitable
packing member i5@ is provided on the rear side
of the fiange 95 to seal about the ram 52a. A
spring 59a surrounds the ram 52a and has one 20
end cooperating with the rear wall of the handle
5la and has its other end cooperating with a
threaded nut member I9? which holds the pack
spring 92 is drawn forwardly through the open
ing 2'Ia with the tube I IEL and does not need to be
compressed during the process of loading lubri
cant in the assembly. The tube IIa may be ing member IDO under compression. The spring
drawn
outwardly until the outer or forward plate . 39n is operable to return the handle 5Ia and the 25
25
ram 52a to their normal positions after forward
89 of the follower I3a strikes the spring 93. The
spring 93 operates to yieldingly limit the outward actuation. Pins 55a in the boss 54a operate in
slots 552L in the tube 59a to prevent turning of
or forward movement of the follower I3“, stop
the handle 5in on the tube 50“ and to limit the
ping the follower at the forward end of the sec
movement of the handle and ram. When the 30
30 tion I5 when the section I5 has been substan
tially entirely filled or loaded with lubricant. handle 5Ia and the ram 52” are in their normal
The cap I'I provided with the desired ram unit is
then reapplied to the section I5 and the tube‘ I Ia
is shifted rearwardly or inwardly until its collar
35 25a engages the shoulder 81. During this inser
tion of the tube IIa the spring 93 yields further
due to the increased pressure on the lubricant
resulting from its displacement by the tube. The
spring 93 thus facilitates the assembly of the ap
40 paratus during the loading process. The socket
39 of the guide 36 receives, centers and supports
the rear portion of the cylinder I2. The nut 20a
is then threaded in the opening 2'Ia to hold the
tube Il!a against movement. The gun is then in
45 condition for operation.
The ram unit Mb illustrated in Fig. '7 of the
drawings is in the nature of a manually operable
high pressure unit capable of ejecting the lubri~
cant through the discharge tube I I or I Ia at rela
tively
high pressures. The ram unit Idb may be
50
employed on either of the previously described
container assemblies. The unit Mb includes a
handle Sla, a guide tube 50a, a cylinder liner or'
bushing 95 and a ram 52a operable in the bush
ing 95.
The handle Sie and the guide tube 5I]a may
be substantially identical with the handle 5I and
the tube 59 of the unit illustrated in Figs. 1 and 3
of the drawings.
The tube 59a is shiftably re
60 ceived in a tubular boss 54a on the handle 5Ia
whereby the handle may be reciprocated on the
tube. An integral socket part 53a is provided on
the forward end of the tube 59a and is adapted to
be threaded on the boss 23 to secure the unit Mb
65 to the container assembly.
The cylinder liner or bushing 95 is carried by
the guide tube 59 to extend into and reduce the
effective diameter of the cylinder I2. The bush
ing 95 is an elongate tubular part adapted to ex
tend through the guide 35 and cylinder I2 to a
point adjacent the discharge valve 3l. The in
ternal diameter of the bushing 95 is substantial
ly less than the internal diameter of the cylinder
I2.
75
The bushing 95 may have a flange 96 at its
rear end threaded in the forward portion of the
unactuated positions the forward end of the ram
52%L is adjacent the ports 97.
The operation of the manually operable ram
unit Mb is substantially identical with the opera 35,
tion of the ram unit I6. The handle 5t"L may be
pressed or moved forwardly relative to the con
tainer assembly to move the ram 52a forwardly
through the bushing 95. ri‘he ram 52a moving
forwardly through the bushing 95 discharges or
ejects a charge of lubricant into the discharge
tube II or il21 at a relatively high pressure. The
spring 59a is operable to return the handle 5Ia
and the ram 52€L and upon the return movement
of the ram a charge of lubricant is drawn or 45
forced into the bushing 95. It will be apparent
how the handle 5Ia may be reciprocated to effect
the discharge of the desired quantity of lubricant
from the gun at a relatively high pressure. When
the unit Iläb is to be applied to the gun the liner 50
or bushing 95 is entered through the guide 35
to be received in the cylinder i2. The guide 3G
operates to properly center the bushing 95 so
that the socket part 53a may be threaded on the
boss 23 to secure the ram unit to the container 55
assembly. When the socket part 53EL has been
properly threaded on the boss 23 the unit Mb is in
condition for operation.
The present invention provides a grease gun
embodying a power operated ram unit I 4f» and 60
low pressure and high pressure manually oper
able ram units I@ and Iêb that may be inter
changeably employed on the container and dis
charge tube assemblies. The ram units may be
easily and quickly exchanged without disturbing
the other parts of the gun.
In exchanging the
ram unit on the fluid pressure primed container
assembly illustrated in Figs. l and 2 of the draw
ings it is necessary to open the valve 41 before
removing the ram unit from the cap Il so that
the lubricant is not discharged through the rear
end of the gun.
Before removing a ram unit
from the spring loaded assembly illustrated in
Fig. 5 of the drawings it is necessary to unthread
the nut 20a and thus relieve the spring pressure 75
2,114,509
onV the follower '§38 so that the lubricant is not
forced through the rear end of the gun upon re
moval of the ram unit. The guide 3@ operates
to center and align the rams with the cylinder I2
and locate the rain units so that they may be
easily and properly applied to the container as
sembly.
Having described only typical preferred forms
and applications of my invention, I do not wish
10 to be limited or restricted to the specific details
herein set forth, but wish to reserve to myself
any variations or modifications that may appear
to those skilled in the art or fall within the scope
15
of the following claims.
Having described my invention, I claim:
l. In a grease gun the combination of, a con
tainer for lubricant, means closing the forward
end of the container, a discharge tube secured to
said means and extending rearwardly in the con
20i tainer, a cylinder at the rear end of the dis
charge tube, a check valve controlling communi
cation between the cylinder and the tube, a rear
cap closing the rear end of the container, and a
ram unit secured to the rear cap and including a
~ f ram operable in the cylinder.
2. In a grease gun the combination of, a con
tainer for lubricant, means closing the forward
end of the container, a discharge tube secured to
said means and extending rearwardly in the con
ïtainer, a cylinder at the rear end of thedis
charge tube, a valve controlling communication
between the cylinder and the discharge tube,
a rear cap closing the rear end of the container,
an ejector unit on the cap including'a recipro
" I cable ram unit, and a guide at the cap for guid
ing the cylinder to receive the ram.
3. In a grease gun the combination of, a con
tainer for lubricant, means closing the forward
end of the container, a discharge tube secured to
said means and extending rearwardly in the con
tainer, a valved cylinder at the rear end of the
discharge tube, a cap closing the rear end of the
container, an ejector unit carried by the cap and
including a reciprocable ram, and a guide on the
` » rear cap ported to admit lubricant to the cylinder
and centering the cylinder to receive the ram.
4. In a grease gun, the combination of, a con
tainer for lubricant, a discharge tube extending
rearwardly in the container, a valved cylinder on
'- the rear end of the discharge tube, means forc
ing lubricant from the container into the cylinder
at super-atmospheric pressure, an ejector unit on
the rear end of the container including a ram for
ejecting lubricant from the cylinder, and a guide
ïreceiving the rear portion of the cylinder and
operable to center the ram of said unit for opera
tion in the cylinder.
5. A lubricant gun including, a ‘lubricant con
tainer, a lubricant discharge tube extending rear
wardly in the container from its forward end, a
valved cylinder on the rear end of the tube, a ram
_ unit on the rear end of the container including a
ram for operating in the cylinder, and a guide in
the container maintaining a coaxial relationship
’ between the ram and the cylinder, and having
a- port for admitting lubricant from the con
tainer to the cylinder.
'
6. A lubricant gun including, a lubricant con~
tainer, a lubricant discharge tube extending rear
wardly in the container from its forward end,
a valved cylinder on the rear end of the tube, a
follower in vthe 'container acting rearwardly
against the lubricant therein, a ram unit on the
rear end of the vcontainer including a ram` for
75 operating in the cylinder, and a guide in the con
7,
tainer centering the cylinder to receive the ram
and having a port for admitting lubricant from
the container to the cylinder.
7. A lubricant gun comprising, a lubricant con
tainer, a lubricant discharge tube entering an end
of the container, releasable means holding ‘the
-tube against movement relative to the container,
a cylinder on the inner »end of the tube, a fol
lower operable in th-e container on the tube to
feed lubricant to thefcylinder, ejector means for 10
ejecting the lubricant from the cylinder, and
means limiting travel of the follower on the tube
whereby the tube may be released from the con
tainer and drawn outwardly to cause the follower
to draw a supply of lubricant into the container. 15
8. A lubricant gun comprising, a lubricant con
tainer, a lubricant discharge tube entering an end
of the container, releasable means holding the
tube against movement relative to the container,
a cylinder on the inner end of the tube, a follower
operable in the container on the tube to feed
lubricant to the cylinder, a spring on the tube
for urging the follower against the lubricant in
the container, a ram for ejecting lubricant from
the cylinder, and means causing the follower to
move with the tube when the ñrst named means
is released and the tube is míoved outwardly to
draw a supply of lubricant into the container.
9. A lubricant gun comprising, a lubricant con
tainer, a lubricantldischarge tube entering an
end of the container, releasable means holding
the tube against movement relative to the con
tainer,'a cylinder on the inner end of the tube,
a follower operable in the container on the tube
to feed lubricant to the. cylinder, a ram for Siti
ejecting lubricant from the cylinder, means limit
ing travel of the follower on the tube whereby the
tube may be released from the container and
drawn outwardly to cause the follower to draw a
supply of lubricant into the container, and a
spring in the forward portion of the container
limiting the forward travel of the follower.
l0. A lubricant gun comprising, a lubricant
container, a lubricant discharge tube entering an
end of the container, releasable means holding
the tube against movement relative to the con
tainer, a cylinder on the inner end of the tube, a
follower operable in the container on the tube to
feed lubricant to the cylinder, a spring bearing
against the follower and a part on the tube to
urge the follower against the lubricant in
container, a ram for ejecting lubricant from
cylinder -through the tube and a part on
tube cooperable with the follower to move
the
the
the
the
same forwardly when said means is released and
56
the tube is moved forwardly.
ll. A lubricant gun including, a lubricant con
tainer having forward and rear caps, a discharge
tube extending through the forward cap, means
releasably securing the tube to the forward cap,
a cylinder at the inner end of the tube, a follower
operable in the container to feed lubricant to the
cylinder, a spring surrounding the tube and bear~
ing rearwardly against the follower, a part on the
tube forming an abutment for the forward end
of the spring, a part on the tube limitingv the reara
ward travel of the follower, the spring ‘being
movable through the forward cap with the tube
when the tube is moved forwardly to cause the
follower to draw a charge of lubricant into the
container, and a plunger operable in the cylinder 705
to eject lubricant through the tube.
12. A lubricant gun including, a lubricant con
tainer having forward and rear caps, a discharge
tube extending through the forward cap, means
2,114,509
8
releasably securing the tube to the forward cap,
a cylinder at the inner end of the tube, a follower
operable in the container to feed lubricant to the
cylinder, a spring surrounding the tube and bear
ing rearwardly against the follower, a part on the
tube forming an abutment for the forward end
_of the spring, a part on the tube limiting the
rearward travel of the follower, the spring being
‘movable through the forward cap with the tube
10 when the tube is moved forwardly to cause the
follower to draw a charge of lubricant into the
container, and a ram unit removably arranged on
the rear cap and including a ram operable in the
cylinder.
15
13. A lubricant gun including, a lubricant con
tainer having forward and rear caps, a discharge
tube extending through the forward cap, means
releasably securing the tube to the forward cap, a
cylinder at the inner end of the tube, a follower
20 operable in the container to feed the lubricant to
the cylinder, a pressure resisting valve controlling
communication between the cylinder and the dis
charge tube, a unit secured to the rear cap and
including, a ram operable in the cylinder, and
25 cylinder and piston means operating the ram.
14. A lubricant gun including, a lubricant con
tainer having forward and rear caps, a discharge
tube extending through the forward cap, means
releasably securing the tube to the forward cap,
30 a cylinderon the inner end of the tube, a pres
sure resisting valve controlling communication
between the cylinder and the discharge tube, a
guide on the rear cap centering the cylinder and
ported to admit lubricant to the cylinder, and a
35 ram unit removably secured to the rear cap in
cluding a ram operable in the cylinder to eject
lubricant through the tube, and means for oper
ating the ram.
15. A lubricant gun including, a lubricant con
40 tainer having forward and rear caps, a discharge
tube extending through the forward cap, means
releasably securing the tube to the forward cap,
a valved cylinder on the inner end of the tube, a
ported guide on the rear cap for admitting lubri
45 cant to the cylinder, and a ram unit removably
secured to the rear cap including a ram centered
by the guide and operable in the cylinder to eject
a ram carried by the handle and operable in the
cylinder.
18. A lubricant gun including, a lubricant con
tainer, a discharge tube secured to the container
and extending from its forward end, a cylinder at
the rear end of the container having valved com
munication with the discharge tube, and a unit
removably secured to the rear end of the con
tainer comprising, a body, a ñuid pressure actu
ated piston operable in the body, and a ram ex 10
tending into the cylinder and operable by the
piston.
19. A lubricant gun including, a lubricant con
tainer, a discharge tube secured to the container
and extending from its forward end, a cylinder at 15
the rear end of the container having valved com
munication with the discharge tube, and a unit
removably secured to the rear end of the con
tainer comprising, a body, a fluid pressure actu
ated piston operable in the body, a handle on the 20
body, valve means controlling the piston, and a
ram extending into the cylinder and operable by
the piston.
20. A lubricant gun including, a lubricant con
tainer,'a discharge tube secured to the container 25
and extending from its forward end, a cylinder
at the rear end of the container having valved
communication with the discharge tube, and a
removable unit on the rear end of the container
including, a bushing lining the cylinder, a part 30
reciprocable relative to the bushing, and a ram
on said part operable in the bushing to eject
lubricant through the tube.
2l. A lubricant gun including, a lubricant con
tainer, a discharge tube secured to the container 35
and extending rearwardly therein to adjacent its
rear end, a cylinder at the rear end of the con
tainer, means feeding lubricant from the con
tainer to the cylinder, a valve controlling com
munication between the cylinder and the dis 40
charge tube, a guide part on the container, a
bushing on the guide part lining the cylinder, a
handle reciprocable on the guide part, and a ram
on the handle operable in the bushing to eject
45
lubricant through the tube.
22. A lubricant gun including, a lubricant con
taineryhaving forward and rear caps, a discharge
lubrican*L through the tube, and means for oper
ating the ram, the last mentioned means includ
50 ing a cylinder and piston means, and a valved
control for the cylinder and piston means.
tube extending through the forward cap to ad
jacent the rear cap, means rigidly securing the
16. A lubricant gun including, a lubricant con
tainer having forward and rear caps, a discharge
cap for admitting lubricant to the cylinder, and
tube extending through the forward cap, means
55 releasably securing the tube to the forward cap, a
valved cylinder on the inner end of the tube, a
ported guide for the cylinder on the rear cap ad
mitting lubricant to the cylinder, and a ram unit
removably secured to the rear cap including a
60 guide part, a handle reciprocable on the said
guide part, and a ram carried by the handle,
centered by said guide part and operable in the
cylinder to eject lubricant through the tube.
17. A lubricant gun including, a lubricant con
65 tainer, a discharge tube stationarily secured to
the container to extend rearwardly therein and
extending from its forward end, a cylinder at the
tube to the forward cap, a valved cylinder on the 50
inner end of the tube, a ported guide on the rear
a ram unit removably secured to the rear cap
including, a guide part on the container, a bush
ing on the guide part lining the cylinder, a handle 55
reciprocable on the guide part, and a ram on the
handle operable in the bushing to eject lubricant
through the tube.
23. A lubricant gun including, a lubricant con
tainer, a lubricant discharge tubev entering the 60
container, releasable means holding the tube
against movement relative to the container, a
cylinder on the inner end of the tube, a follower
operable in the container on the tube to feed lub
ricant to the cylinder, means for admitting air 65
under pressure to the container to actuate the
follower, a ram for ejecting lubricant from the
rear end of the container, a valve controlling
cylinder, and means for causing the follower to
communication between the cylinder and the dis
70 charge tube, and a unit removably secured to the
rear end of the container comprising, a guide
part, a handle reciprocable on the guide part, and
move with the tube when the ñrst named means
is released and the tube is moved outwardly to 70
draw a supply of lubricant into the container.
`
CARL W. STOLL.
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